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SC195 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC195 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 18 page  © 2009 Semtech Corporation POWER MANAGEMENT 1 SC195 3.5MHz, 500mA Synchronous Step Down DC-DC Regulator Features Input Voltage — 2.9V to 5.5V Output Voltage — 0.8V to 3.3V Output current capability — 500mA Efficiency up to 94% 15 Programmable output voltages High light-load efficiency via automatic PSAVE mode Fast transient response Temperature range — -40 to +85°C Oscillator frequency — 3.5MHz 100% duty cycle capability Quiescent current — 38μA typ Shutdown Current — 0.1μA typ Internal soft-start Over-voltage protection Current limit and short circuit protection Over-temperature protection Under-voltage lockout Floating control pin protection MLPQ-UT8 1.5 x 1.5 x 0.6 (mm) package Pb free, Halogen free, and RoHS/WEEE compliant Applications Smart phones and cellular phones MP3/Personal media players Personal navigation devices Digital cameras Single Li-ion cell or 3 NiMH/NiCd cell devices Devices with 3.3V or 5V internal power rails Description The SC195 is a high efficiency, 500mA step down regula- tor designed to operate with an input voltage range of 2.9V to 5.5 V. Four control logic pins are used to select the output voltage, eliminating the need for external feed- back resistors. The control pins allow the output voltage to be set to a single level or controlled dynamically. Fifteen different output voltages can be selected. Pulling all four control pins low disables the output. The SC195 operates at a fixed 3.5MHz switching fre- quency, minimizing the size and cost of external components. A power-save (PSAVE) mode is used to opti- mize efficiency at light loads for each output setting. Hysteresis is included to prevent chattering between PSAVE and normal pulse-width modulation (PWM) mode. The SC195 provides short-circuit and thermal protection to safeguard the device under extreme operating condi- tions. Other features include internal soft-start circuitry, limiting in-rush current, and under-voltage lockout, pre- venting the device from malfunction when the input voltage drops below the rated minimum level. These fea- tures coupled with the tiny 1.5x1.5x0.6 (mm) package make the SC195 a versatile product well suited for porta- ble applications. SC195 IN CTL3 CTL2 CTL1 CTL0 LX OUT GND VOUT 0.8V to 3.3V VIN 2.9V to 5.5V LX 1.0μH COUT 10μF CIN 4.7μF Control Logic Lines Typical Application Circuit September 23, 2009 |
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